Each LAV has ____ drain valve.

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Multiple Choice

Each LAV has ____ drain valve.

Explanation:
The lavatory waste system uses a single drain path, so there is one drain valve per lav. This valve sits at the lav bowl and is normally closed to prevent odors; when you operate the flush, the valve opens to release the wastewater into the waste system and tank. The sink has its own drain path, but that is separate from the lav’s drain valve. Because the design provides one discharge route for lav waste, the correct count is one.

The lavatory waste system uses a single drain path, so there is one drain valve per lav. This valve sits at the lav bowl and is normally closed to prevent odors; when you operate the flush, the valve opens to release the wastewater into the waste system and tank. The sink has its own drain path, but that is separate from the lav’s drain valve. Because the design provides one discharge route for lav waste, the correct count is one.

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